Relay for the selective reception of wireless impulses



April 14, 1931. w. G. H. FINCH 6 RELAY FOR "THE SELECTIVE RECEPTION OF WIRELESS IMPUlJSES Original Filed Aug. 18, 1922 2 Sheets-Sheet 1 l'l'i'l' I INVENTOR.

Wm. HM

mad/k5? A ITORNE Y.

April 14, 1931. w. s. H. FINCH 1,801,146

RELAY FOR THE SELECTIVE RECEPTION OF WIRELESS IMPULSES Original Filed Aug. 18, 1922 2 Sheets-Shee 2 UVVE/VTUR I William G. H Finch A TTOHNEV Patented Apr. 14, 1931 PATENT OFFICE WILLIAM G. H. HINGE, 03 NEW $93K, N. Y.

RELAY FOR THE fiELECTIVE REGEPTIOH F WIRELESS IKPULBES Original application filed August 18, 1922, Serial Ho. .1924. Serial My present invention relates generally to apparatus employed for the reception of electrical impulses and more particularly to the reception of such impulses at radio requencies and has. special reference to the provision of radio receiving systems for selectively receiving impulses for operating devices such, for example, as recording mechanisms.

My present invention comprehends the 1o provision in an apparatus operating relatively large power consuming mechanisms by remote control at radio frequencies, of a means for sensitively translating at the receiving end the rad1o impulses into mechanism actuating impulses.

The principal object of my invention is the provision in the radio receiving apparatus of a wireless typewriter of a new and improved relay adapted for translating said '20 impulses into wireless t pewriter operation.

For the attainment 0 this and such other objects as may appear and be pointed out hereinafter, I have illustrated an embodiment of my invention in the drawings,

15 wherein:

Figure 1 is a diagrammatic showing of the receiving apparatus employing my new re Tigure 2 is a view in vertical section of In the relay employed by me; and

Figure 3 is the top plan view thereof.

Before proceeding to describe my invention, I will premise that it is particularly intended for the receiving end of a wireless typewriter system in which at the transmitting end (not shown) is an arrangement whereby, by the employment either of a perforated strip or by the operation of a keyboard very similar to that of a typewriter, groups of impulses corresponding to the Baudot code are transmitted through the other at radio frequencies.

My present invention relates to the reception of such impulses by apparatus such as diagrammatically shown in Fig. 1 of the drawing.

Referring to Fig. 1 of the drawings, the radio receiver comprises an antenna system 60 20, a primary receiving inductance 110, so

582,75 Divided and this application filed Kay 28, No. 716,428.

ries condenser 111 and round 112. Inductively associated with the primary winding 110 is secondary winding 11 3 tuned by variable condenser 114. This adjustable circ'uit is connected through grid leak and grid condenser 115 with thermionic vacuum tube 116 having heated filament 117, grid 118 and plate 119. The plate circuit includes coupling coil 120 inductively associated with the secondary inductance 113 and including primary 121 of transformer 122 and high potential battery 123. The filament 117 is energized by battery 124., The circuit is adjustable for both heterodyne and regenerative reception. The transformer 122 has its secondary winding 125 connected to the input circuit of vacuum tube amplifier 126. The amplifier comprises vacuum tube 126 havin filament 127, grid 128, and plate 129 and out put circuit 130 and 123. The filament 127 is heated by battery 124. The winding 130 forms the primary for transformer 131 the secondary winding 131- of which is-connected to the input circuit of vacuum tube amplifier 132. The vacuum tube 132 comprises the filament 133 energized by battery 123, grid 131 and plate 135 For the purpose of providing on the one hand a current which will be sufficient to operate the energy consuming apparatus, such as that shown in the typewriter 10, and at the same time enable this operation to be 'controlled accurately through the weak im pulses received at the circuit 21, leading rom the amplifying tube 132, i have pro vided a plurality of local circuits 23 and 24, the circuit 23 being controlled by the relay 25, which in turn controls the relay 26 through the local circuit 23.

' The high frequency impulses from the receiving apparatus are first conveyed to the relay which is so extremely sensitive that it will be operated even on the weakest impulses to close the local circuit 23 through the energy from the battery 66 to operate the relay of a heavier ty e such as the Wheatstone relay 26. This eatstone relay in turn controls a second local circuit 24 of suflicient strength to o crate the mechanim 10 as and when desire In Figures 2 and 3, I show a preferred form of relay and upon viewing these figures it will be observed that this relay comprises a shell or casing 31 mounted upon the base 30. Disposed within the shell 31 is a circularpermanent magnet 35 divided at one side to provide spaced poles located at the opposite sides of the median plane of the magnet 35. U-shaped pole pieces 33 and 34 each has'one of its limbs resting directly against and secured to one pole of said magnet. by means of screw or securingelement 36. The limbs of the pole pieces 33 and 34 project toward one another beyond the poles of the permanent magnet, and an electromagnet is secured between the pole pieces. This electromagnet embodies a flattened tube 37 having its sides approximately flush with the ends of the. ole pieces 33 and 34, and provided with flanges or heads at its ends resting against the limbs of the pole pieces. The electromagnet embodies a cell wound around the tube or spool 37, as will be apparent, and as is well understood. An armature 39 is' fulcrumed within the tube or electromagnet 37 by means of the wires or pins 40 carried by the tube 37.

The armature 39 has its upper end 19 normally maintained in contact with the post 51 by the spring 52 secured at one end to the post 53 and at its other end to the member 54 arranged to engage the lower end of the armature 39.

The leads of the radio receiving circuit are secured to the binding posts 61, 62, which are connected to the elec'tromagnet of the relay.

When this electroma et is energized, the armature 39 is moved mto contact with the contact post 63 which, as shown in Figure 3, is electrically connected to the post 64, the return lead being through the post 65.

From the description thus far given, it will be understood that the receiving impulses are transmitted to the sensitive relay 25 which controls the more rugged relay 26 which in turn controls the operating mechanism 10.-

The series of successive impulses through local circuit 24 are then employed to operate mechanism 10 in a manner that need not be herein described.

I may employ'a variable condenser to make the impedance of the external circuit equal to the impedance of the internal grid circuit. Where, however, I employ a multistage radio circuit as in Figure 1, I have found that by placing the condenser (such as a variable condenser 27) only in the last stage of amplification the desired end -or result is produced. In other words, it is unnecessary to employ condensers in the intermediate stage of the circuit. The real and essential work is done in this last sta e and the utlhzation of the condenser only in this last stage is one of the features of the present invention.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is' 1. A relay, comprising a split ring permanent magnet, an armature member positioned therewithin, an electro-magnet to operate the armature member, a vertical arm carried by one end of said member and extending therefrom a substantial distance beyond the electro-magnet, a contact element at the free end of said extending arm, and spaced contacts between which said contact element is received.

2. A relay, comprising a split ring permanent magnet and an electro-magnet, an armature member positioned within the permanent magnet and operated by the electromagnet, a vertical arm carried by one end of said member and extendin therefrom a substantial distance beyond t e ermanent magnet. a contact element at the ee end of said extending arm, spaced contacts between which said contact element is received, and a spring cooperating with the opposite'end of the armature member to normally maintain the contact element in engagement with one of said contacts.

In testimony whereof, I have hereunto signed my name.

III 

